Direct effect of Pa(CO2) on respiratory sinus arrhythmia in conscious humans.
Direct effect of Pa(CO2) on respiratory sinus arrhythmia in conscious humans.
复制标题
Pa(CO2) 对清醒人呼吸性窦性心律失常的直接影响。
DOI:
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发表时间:
2002
期刊:
影响因子:
--
通讯作者:
J. Fisher
中科院分区:
文献类型:
--
作者:
N. Sasano;A. Vesely;J. Hayano;H. Sasano;R. Somogyi;D. Preiss;K. Miyasaka;H. Katsuya;S. Iscoe;J. Fisher
Respiratory sinus arrhythmia (RSA) may improve the efficiency of pulmonary gas exchange by matching the pulmonary blood flow to lung volume during each respiratory cycle. If so, an increased demand for pulmonary gas exchange may enhance RSA magnitude. We therefore tested the hypothesis that CO2 directly affects RSA in conscious humans even when changes in tidal volume (V(T)) and breathing frequency (F(B)), which indirectly affect RSA, are prevented. In seven healthy subjects, we adjusted end-tidal PCO2 (PET(CO2)) to 30, 40, or 50 mmHg in random order at constant V(T) and F(B). The mean amplitude of the high-frequency component of R-R interval variation was used as a quantitative assessment of RSA magnitude. RSA magnitude increased progressively with PET(CO2) (P < 0.001). Mean R-R interval did not differ at PET(CO2) of 40 and 50 mmHg but was less at 30 mmHg (P < 0.05). Because V(T) and F(B) were constant, these results support our hypothesis that increased CO2 directly increases RSA magnitude, probably via a direct effect on medullary mechanisms generating RSA.
DOI:
10.1016/0735-1097(89)90408-7
发表时间:
1989-11-01
影响因子:
24
作者:
APPEL, ML;BERGER, RD;COHEN, RJ
通讯作者:
COHEN, RJ
影响因子:
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作者:
HIRSCH, JA;BISHOP, B
通讯作者:
BISHOP, B
DOI:
10.1016/0034-5687(83)90123-8
发表时间:
1983
期刊:
Respiration physiology
影响因子:
--
作者:
Fisher,JT;Sant'Ambrogio,FB;Sant'Ambrogio,G
通讯作者:
Sant'Ambrogio,G